To the OP, I ask myself the same question. Adding a screen or lights to me is not innovation. The playfields are static. Something like Lexi Lightspeed is pretty cool for teh simple reason the only things static on the playfield is return ramps, flippers and slings. To me, being dynamic is key. Maybe having ramps behind the playfield with a diverter so you aren't sure where the ball comes out. Also a subway system with a diverter, and "super coil" to launch the ball out of wherever the game dynamically chooses to do so.

Other than that, Stern and JJP need to cater to the route guys and provide a game that's not only fun but mechanically reliable. Apparently fun is never mechanically reliable lol